Thank you for reaching out to the API Support team here at Constant Contact.
This community post is a bit outdated. We released our new welcome emails in 2015. You can now create multiple welcome mails within your account; you can even schedule each of them to go to a different list.
See this link for step by step instructions on how to create one: https://knowledgebase.constantcontact.com/articles/KnowledgeBase/6498-create-a-new-welcome-email-campaign
Please let me know if you have any other questions!
Sincerely, David B. API Support Specialist
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